Mounting for load responsive capsules



April 11, 1950 L. s. WILLIAMS 2,503,698

MOUNTING FOR LOAD RESPONSIVE CAPSULES Filed Feb. 9, 1946 m :11 m 7 :+r-1- 5 L H i L I 1 i h 2 8 LE :KW

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ATTORNEYS INVEN TOR.

Patented Apr. 11, 1950 UNITED STATES PATENT OFFICE MOUNTING FOR- LOAD RESPONSIVE CAPSULES Lawrence S. Williams, Toledo, Ohio, assignor to Toledo Scale Company, Toledo, Ohio, a corporation of New Jersey Application February 9, 1946, Serial No. 646,592

vers, is that the fulcrum stands for the lever scale or the bases of the hydraulic capsules of the capsule plate to settle until substantially uniform pressure is exerted throughout its entire bearing surface. If the sheet of material is nonresilient the capsule will remain in its settled position after the removal of load and further repetitions of the loading will not alter its position. Therefore the scale may be calibrated after it has once been loaded to capacity with assurance that the capsules will not later shift a hydraulic scale shall not shift or deflect when on their foundations and thereby introduce erload is applied to the scale. In a. lever scale rors into the weight indications. If a rigid such shifting causes changes in the angularity material is used instead of the deformable nonin the connections between levers as well as the resilient material or if the capsule is placed dicondition of level of the levers themselves and rectly on the foundation it will be supported on thereby causes errors in the force transmission a few points which may or may not give a stable from the load receiver to the load counterposition. The nonresilient deformable sheet of balancing mechanism. In a hydraulic scale any material effectively prevents any such shifting shifting or unsteadiness of a lower member of or deflection of the capsule.

a capsule acts through the capsule to cause The unit pressures involved between a capchanges in the force-to-pressure translation sule and its foundation in an ordinary hydraulic ratio of the capsule. If the capsules are not weighin scale are insufficient to cause cold flow securely mounted it is impossible to get the scale of even a soft material such as lead, if the mato perform consistently. While a firm support terial is used in the form of a fiat sheet. To for the capsules could be obtained by setting achieve greater yielding of the deformable mathe capsules in concrete such a procedure makes terial during the first time the scale is being it extremely difficult to replace a capsule if one loaded the sheet of deformable material is corshould be damaged. rugated or dimpled so that the forces developed The principal object of this invention is to between the hydraulic capsule and the high spots provide a mounting arrangement for the lower of its foundation will smooth out the corrugaplate of a hydraulic capsule which will firmly tions while the remainder of the sheet remains support the capsule without interfering with its in more or less corrugated form depending upon removal should replacement be necessary. the evenness of the surface of the foundation.

Another object of the invention is to provide While lead is preferred as a deformable maan improved mounting arrangement for a hyterial because of its ductility other ductile madraulic capsule of a weighing scale which mountterials may also be used with similar results. A ing will adjust itself during the first time the sheet of ductile material offers an advantage over scale is loaded and thereafter firmly maintain the use of concrete or other material which the capsule in position. hardens after the capsule has been put in place Another object is to provide means for mount because no bonding take Place d therefore ing a hydraulic capsule used as a support for the no harm is done to the foundation when a capload receiver of a weighing scale which means 81116 is p edwill accommodate itself to small irregularities of A p fi embodiment of the invention in th capsule r its fo ndati and prevent any which these objects and advantages are attained shifting or tipping of the capsule on its founs illustrated in the d w dation. In the drawings:

These and other objects and advantages are Figure I is a side elevation, partly in section apparent from the drawings and the following and with parts broken away, showing the imdescription. proved means for supporting a capsule from a The objects of the invention are attained by foundation. interposing a sheet of deformable, nonresilient 5o Figure II is a plan view of a sheet of corrumaterial between the lower surface of the hygated material suitable for use under the capsule draulic capsule and the foundation on which the shown in Figure I. capsule is supported. Such a sheet of material Figure III is a fragmentary cross sectional has the property that it will deform in the view of the sheet of corrugated material shown regions of high unit pressure and thereby allow in Figure II.

to the scale.-

ance between its periphery and the upstandingrim 2. The diaphragm 3 is supported by hy-- draulic fluid confined in the space beneath it and the fluid is prevented from escaping by a metallic membrane 4 formed as a semicirculararch anchored to the rim 2 by a clamping bar 5 and to the diaphragm 3 by a clamping bar 6; the

clamping bars 5 and 6 being held by a plurality of screws l. A pipe 8 communicating with the chamber formed below the diaphragm 3 serves to transmit the pressure of the hydraulic fluid to a pressure receiving unit'mechanically connected to a load counterbalancing mechanism.

A three sided box-like member 9 bolted to the diaphragm 3 provides support for across bar it from which cross bar brackets supporting a load receiver may be suspended. A plu- 9 serves to connect the diaphragm 3 to a framework. similarly connected to other load supporting capsules which framework prevents any tipping of the diaphragms as loads are applied The bottom of the capsule plate I is formed with a number of shallow ribs l2 extending downwardly from the bottom surface of the plate.

The hydraulic capsule is supported from a a circ lar sheetis used it is'permissible to allow the corners of the capsule to extend slightly beyond the periphery" of the sheet;

The sheet it; may be either circular rectangw lar or any other shape and preferably is corrugated to facilitate its deformation in conforming to the irregularities of the surface of the foundation !3. When the sheet is-circular as is shown in Figureff circular corrugations I 5 may be employed and they may be carried entirely to the center or not. as a matter of choice. The

corrugations l5 should preferably be at least of e such depth that the apparent thickness of the material is doubled; A suitable size of corrugation is shown in Figure III; When such a corrugated sheet of material is placed. un'derthe bottom of a capsule-and'the load is applied those portions of the sheet located on the high spots of the foundation will be subjected to high unit pressures and the corrugations of those regions .will be. pressed down so as torelieve the high pressures and shift part of the load to the:adja- If the capsule cent regions of the foundation. The yielding of the corrugations of the sheet combined with the load concentrating effect of the ribs 12 formed on the lower surface of the capsule are such that the load is substantially uniformly distributed throughout the area of the capsule when the weighing capacity of the scale isreached. After the scale has once been loaded to capacity and the corrugated sheet l5 has been pressed to conform to the irregularities of the capsule and the foundation the sheet will retain its deformed shape after the load has been removed and will riot undergo any appreciable further deformation during subsequent loadings.

If a square sheet of material is used such as the sheet it (Figure IV) the corrugations may be straight and alforiented along one axis or they may be crossed to provide a dimpled surface. Either type of corrugation will give satisfactory results although the dimpled form is preferable where the unit pressures involved are relatively low;

Sheet lead corrugated according to the invention provides a suitable material since it has the properties of being deformable and nonresili'ent. The material dare not be resilient because if it were so it would regain its original form when the load on the scale was removed and the advantages of stability would be lost. However, any ductile material which is subject to cold fiowunder the unit pressure involved in supporting the capsule would be satisfactory as a capsule stabilizing support.

The important element in practicing the invention is to insure that suihcient deformable material is included around the edges of the capsule so that the edges are given a firm support capable of preventing any tipping of the capsule under load. The support at the'center of the capsule is not nearly so critical and. it is for this reason that the centers of the corrugated sheets l4 and [6 may be left fiat without corrugations or even cut out entirely without affecting the performance of the capsule.

While a specific form of the invention has been disclosed it is apparent that modifications may be made without departing from the. spirit of the invention which resides in providing a ductile nonresilient pad or sheet of material which is designed to yield under high unit pressures and thereby provide a substantially uniform support for a hydraulic capsule. v

Having described my invention, I claim:

1. In a weighing scale incorporating hydraulic I force transmitting elements, in combination, a hydraulic capsule serving as a support for a load receiver, a foundation for the capsule, and a sheet of deformable nonresilient material interposed between the capsule andthe-foundation.

2. In a weighing scale incorporating hydraulic force transmitting elements, in combination, a hydraulic capsule serving as a support for a load receiver, a foundation for the capsule, and a C01? rugated sheet of deformable nonresilient material interposed between the capsule and the foundation.

3; In a weighing scale incorporating hydraulic force transmitting elements, in combination, a hydraulic capsule serving as a support for a load receiver, a foundationfor the capsule, and a corrugated lead sheet interposed between the'capsule and the foundation;

4. In a weighing scale incorporating hydraulic force transmitting elements, in combination, a hydraulic capsule'servin'g. as a s'upp'ortfor a-load receiver, the capeule having ribs in low relief formed in 19311114181 surface, a, foundation-flier supporting the ule, and a. sheet of a deformaterial interposed betweefi ithe capsule and the; Qundation.

j LAWRENCE 5. WW.

REFERENCES CITED references are of record in the tile of this part UNITED STATES PATENTS Number Name Date Shuttle! Jan. 2, 1923 Reid Jan. 12, 1932 Marshall Mar. 9, 1943 Patch Jan. 21, 1947 

